The question clearly stated a half-filled glass, and the finger not touching the glass. So, discounting a hugely fat finger, the glass cannot overflow.
What do you mean by that? The 1000 t half or fully immersed weight does impose less strain on the crane, as it is being supported by a force equiv to the water being displaced. In the case of a boat, fully lowered onto the water, the crane registers zero and the weight of the swimming pool increases to water + 1000 t.
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